Filing or the like machine



Dec. l0, 1957 D. J. WILLIAMS 2,815,681

' FILING 0R THE LIKE uAcHINE Filed Aug. 15. 1951 a shears-sneer 1 21 TEIJ i- HHIHIIIN Gttornegs Dec. 10, 1957 f l n. J. WILLIAMS 2,815,681

FILING on THE LIKE MACHINE Filed Aug. 15. 1951 2 sheets-sheet 2 ZmventorPam@ Z J WL'Zh/m United States Patent A.C

FILING R THE LIKE MACHINE Daniel J. Williams, Fairlield, Conn. ,jApplication August 15, 1951, Serial No. 241,950

3 Claims. (Cl. 74-,600)

This invention relates to filingand lappingandthelike machines whereinthe working tool is 1jecip1jocat-ed, and' more particularly to thereciprocating orQstroke `mechanismY of such machines.

A preferred embodiment of the invention is 4illustrated herein. Thespecic structure shown anddescribed has a powered shaft and crank pindriving a reciprocating tool holder through the medium of a cross slide.However, it should be understood that the invention is not limited tothe specific embodiment illustrated, but instead has its scope delinedinthe appended claims.

object of the invention is to provide an improved reciprocating lingmachine with adjustable stroke mechanism characterized by a minimumunbalance of the crank over a wide range of adjustment, thereby makingfor smoother and quieter operation, with less vibration.

Another object of the invention is to provide in a reciprocating filingmachine as above characterized, improvedand simplified damper meansassociated with the reciprocating parts, to Afurther enhance thesmoothness and quietness of operation.

vStill another object of the invention isfto provide an improved filingand lapping maohinein accordance with the foregoing, which is simple and.economical ,to con,- struct and reliable in operation` throughout anextended period of use.

A feature of the invention resides in the simplicity, compactness andsmall size of the stroke-adjustment mechanism.

Other features and advantages will hereinafter appear.

In the accompanying drawings:

Figure 1 is a side view of an improved filing machine embodying thisinvention, shown partly in elevation and partly in vertical section.

Fig. 2 is a fragmentary view of the machine, showing the novelstroke-adjusting mechanism in side elevation.

Fig. 3 is a side view, enlarged, of the stroke-adjusting mechanism ofFig. 2, shown partly in side elevation and partly in vertical section.

Fig. 4 is an elevational view of the stroke adjusting mechanism, showingits inner face.

Fig. 5 is a fragmentary view, partly in elevation and partly in Verticalsection, of the crank pin, cross slide and guide rod of thereciprocating mechanism.

Referring to Fig. l, the improved tiling machine shown therein comprisesa housing arranged to function as a base or pedestal, having anupstanding portion or column 11 at its rear. Reciprocable on the base 10and column 11 is a guide rod 12 carried in bearings 13, 14 and 15, saidrod having upper and lower tool support arms 16 and 17, respectivelyprovided with tool holders 18 and 19 arranged to mount a file or othertool 20.

On the base 10 between the upper and lower arms 16 and 17 a table 21 isprovided, adjustably carried for tilting in all directions by sectormembers 22 and 23 in conjunction with a supporting structure 24 securedto the front upper portion of the base.

The lower tool-support arm 17 is connected with a q ce 2,815,681

Patented Dec. 10, 1957 secondv guderod 2,5 slidably carried by belrlgS.25, and 27 on the housing 10.

Interconnecting the guide rods 12 and 25 is a cross slide 2,8, which isdisposed within the upper front portion of th@ housing 10, beingenclosed by vertical and horizontal partitions 29 and 30 respectively,said partie tions forming withthe upper housing, wallsfa lnbricationchamber 31.

Referring to Fig. .3, the housing 10 has Va horizontal powered shaft 32driven by a pulley 33 and belt 34. A hand wheel 35 is connected with`the pulley 33 ,to enable the shaft 32 to `be adjustably turnedmanually.

In accordance with the present invention a novel, im` proved andsimplified ,adjustable stroke crankmeclianismis `provided on ,thepowered shaft 3 2 to impart a Irecipf rocating movement to theguiderrods ,12.and 25 andthe tool 20 Vin response to turning of thevshaft 32, saidrnechanism being characterized by a minimum of dynamic:-unbalance throughout its range of adjustment., This or member 38 havingthe shape of a sector, saidmemben being angularly movable about thepivot and carrying a crank pin 39 at a point removedffrom .the pivot andnormally out of line with the shaft 32, Aand having al wear shoe39aofhardened steel surroundingrandrotatably mounted on the pin.

Referring to Fig. 5, the crank pin 39 is arranged to4 be received in,and to engage the slot 28a incrosfs slide 28.. For -the purpose oflaltering the eccentricity of the crank pin 39 ,with respect to theshaft 32, ,theV sector,

v member 38 is provided with acurved rack 40 engaged by apinion 41mounted on a shaft 42 passing through4 the powered shaft 32 andfcarryingat its frontend .an adjusting A.wheeli anda manually operableflocknut4,4.

The sector member 3S has an undercut slot 45, Fig. 3,'

here shown in the shape of a T, receiving a locking key 46 carried bythe inner end of the shaft 42.

By the above organization, when the lock nut 44 is loosened, the pinion41 may be rotated by turning the adjusting wheel 43, thereby alteringthe angular position of the sector member 38 and varying theeccentricity of the crank pin 39 with respect to the shaft 32. Thus thestroke of the crank mechanism is altered, changing the stroke of theguide rods 12 and 25 and the stroke of the tool 20. The sector member 38may be locked in any adjusted position by merely tightening the lock nut44 which causes the key 46 to bear against the walls of the slot 45.

I have found that, by the provision of the sector-shaped member 38carrying the crank pin 39, in conjunction with the eccentrically locatedpivot 36 and recessed wheel or counterweight 37a, a minimum amount ofdynamic unbalance is had for various adjusted positions of the membercorresponding to different lengths of stroke,

In Fig. 4 the sector member 38 is located to dispose the crank pin 39 amaximum distance from the powered shaft 32. If, referring to Fig. 4, thepinion 41 is rotated clockwise it will cause the crank pin 39 toapproach the axis of the powered shaft 32, reducing the eccentricity orstroke of the mechanism. The center of inertia of the sector 38 willnot, however, shift as much as the distance moved by the crank pin 39during any adjustment of the sector, as would otherwise be the case ifthe crank pin were carried on a straight slide having purelytranslational movement instead of pivotal movement. Thus, the amount ofunbalance occasioned by adjustment of the sector member 38 is not asgreat as would occur where a straight slide is used to adjust theposition. of a crank pin, and as a consequence a desirable smoothnessand quietness of operation is obtained, with a minimum of vibration andwear on working parts.

For the purpose of damping the movement of the guide rods 12 and 25 tofurther improve the quietness and smoothness of the machine, cups 47 aresecured to the underside of the partition 30, forming oil chambers 48around the lower ends of the guide rods. Ports 49 are provided in theoil chambers 48, communicating with the oil'chamber 31.` In theoperation of the filing machine, oil which is in the chamber 31 will110W into the smaller chambers 48, lling these chambers, and such oilwill be alternately forced partially out of the charn bers 48 and thensucked into the chambers 48 during reciprocating movements of the guiderods 12 and 25. By this action a hydraulic damper is provided, acting onth'e guide rods 12 and 25.

'Variations and modifications may be made within the scope of the claimsand portions of the improvements may be used without others.

' I claim:

' 1. In a device for reciprocating a member, means for reciprocating themember comprising a power-driven shaft; a pivot eccentrically carried bysaid shaft; an arm mounted for angular movement about said pivot, saidarm having an undercut slot; a crank pin carried by the arm at a pointspaced from the pivot; means connecting the member to the crank pin toreciprocate the member in response to travel of the crank pin; and meansincluding a key in the undercut slot and a tie rod connected with saidkey and passing through the power-driven shaft, for drawing said keyinwardly and holding said arm in different angular positions about thepivot whereby different eccentricities of the crank pin with respect tothe shaft can be maintained.

2. A device for reciprocating a member comprising a crank pin;connection means between said pin and member to reciprocate the latterin response to travel of the pin in a closed path; a power-driven shaft;a pivot eccentrically carried by said shaft; a sector-shaped membercarried by the shaft, mounted for angular movement about said pivot,said sector-shaped member having a curved rack and an undercut slotcoextensive with the rack, and carrying the crank pin at a point spacedfrom the pivot; a pinion engaging the rack; a shaft carrying the pinion,passing through the power-driven shaft whereby rotation of said pinionshaft positions the sector in different angular positions about thepivot to vary the eccentricityof the crank pin with respect to thepowerdriven shaft; a key connected to said pini-on shaft for axialmovement therewith, occupying the undercut slot of the sector member,said slot having a wall spaced from the bottom of said slot to limitmovement of said pin in a direction axially of said pinion shaft;manually operable means for turning the pinion shaft; and manuallyoperable means for axially moving the pinion shaft to tighten the keyagainst a wall of said slot.

3. The invention as defined in claim 2 wherein a iiywheel having a flatperipheral portion is mounted on said power-driven shaft and is providedwith a recess in said flat portion, and wherein said pivot andsectorshaped member are mounted in said recess whereby a minimum ofdynamic unbalance is obtained.

References Cited in the file of this patent UNITED STATES PATENTS241,488 Gould et al May 17, 1881 421,297 Mills Feb. 11, 1890 731,116Myer Jan. 26, 1903 811,426 Mitchell Ian. 30, 1906 1,194,414 Olson Aug.15, 1916 1,230,779 Rearwin a- June 19, 1917 1,322,873 Brull Nov. 25,1919 1,609,843 Stimpson Dec. 7, 1926 1,636,729 Yarrington July 26, 19271,779,981 Nickerson Oct. 28, 1930 1,821,787 Black Aug. 19, 1931-1,847,048 Orr Feb. 23, 1932 l1,917,701 l ACrites et al July 11, 19332,081,373 v Viscasillas May 25, 1937 2,508,390 Hungerford May 23, 19502,551,359 Bannow et al. May 1, 1951 2,567,974 Scott Sept. 18, 1951

